#!/bin/sh

GIT_DIR=`git-rev-parse --git-dir` || exit $?

die () {
    echo >&2 "$*"
    exit 1
}

type="$(git-cat-file -t "$1" 2>/dev/null)" ||
	die "$1: no such object."

test "$type" = tag ||
	die "$1: cannot verify a non-tag object of type $type."

git-cat-file tag "$1" >"$GIT_DIR/.tmp-vtag" || exit 1
cat "$GIT_DIR/.tmp-vtag" |
sed '/-----BEGIN PGP/Q' |
gpg --verify "$GIT_DIR/.tmp-vtag" - || exit 1
rm -f "$GIT_DIR/.tmp-vtag"